USE [Forums]
GO

/****** Object:  StoredProcedure [dbo].[Paging_RowCount]    Script Date: 08/09/2012 17:03:41 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[Paging_RowCount]
(
@Tables varchar(1000),
@PK varchar(100),
@Sort varchar(200) = NULL,
@PageNumber int = 1,
@PageSize int = 10,
@Fields varchar(1000) = '*',
@Filter varchar(1000) = NULL,
@Group varchar(1000) = NULL)
AS

/*Default Sorting*/
IF @Sort IS NULL OR @Sort = ''
	SET @Sort = @PK

/*Find the @PK type*/
DECLARE @SortTable varchar(100)
DECLARE @SortName varchar(100)
DECLARE @strSortColumn varchar(200)
DECLARE @operator char(2)
DECLARE @type varchar(100)
DECLARE @prec int

/*Set sorting variables.*/	
IF CHARINDEX('DESC',@Sort)>0
	BEGIN
		SET @strSortColumn = REPLACE(@Sort, 'DESC', '')
		SET @operator = '<='
	END
ELSE
	BEGIN
		IF CHARINDEX('ASC', @Sort) = 0
			SET @strSortColumn = REPLACE(@Sort, 'ASC', '')
		SET @operator = '>='
	END


IF CHARINDEX('.', @strSortColumn) > 0
	BEGIN
		SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX('.',@strSortColumn))
		SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX('.',@strSortColumn) + 1, LEN(@strSortColumn))
	END
ELSE
	BEGIN
		SET @SortTable = @Tables
		SET @SortName = @strSortColumn
	END

SELECT @type=t.name, @prec=c.prec
FROM sysobjects o 
JOIN syscolumns c on o.id=c.id
JOIN systypes t on c.xusertype=t.xusertype
WHERE o.name = @SortTable AND c.name = @SortName

IF CHARINDEX('char', @type) > 0
   SET @type = @type + '(' + CAST(@prec AS varchar) + ')'

DECLARE @strPageSize varchar(50)
DECLARE @strStartRow varchar(50)
DECLARE @strFilter varchar(1000)
DECLARE @strSimpleFilter varchar(1000)
DECLARE @strGroup varchar(1000)

/*Default Page Number*/
IF @PageNumber < 1
	SET @PageNumber = 1

/*Set paging variables.*/
SET @strPageSize = CAST(@PageSize AS varchar(50))
SET @strStartRow = CAST(((@PageNumber - 1)*@PageSize + 1) AS varchar(50))

/*Set filter & group variables.*/
IF @Filter IS NOT NULL AND @Filter != ''
	BEGIN
		SET @strFilter = ' WHERE ' + @Filter + ' '
		SET @strSimpleFilter = ' AND ' + @Filter + ' '
	END
ELSE
	BEGIN
		SET @strSimpleFilter = ''
		SET @strFilter = ''
	END
IF @Group IS NOT NULL AND @Group != ''
	SET @strGroup = ' GROUP BY ' + @Group + ' '
ELSE
	SET @strGroup = ''
	
/*Execute dynamic query*/	
EXEC(
'
DECLARE @SortColumn ' + @type + '
SET ROWCOUNT ' + @strStartRow + '
SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
SET ROWCOUNT ' + @strPageSize + '
SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' + @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
'
)

GO


